Laravel学习笔记之Seeder填充数据小技巧

说明：本文主要聊一聊Laravel测试数据填充器Seeder的小技巧，同时介绍下Laravel开发插件三件套，这三个插件挺好用哦。同时，作者会将开发过程中的一些截图和代码黏上去，提高阅读效率。

备注：在设计个人博客软件时，总会碰到有分类Category、博客Post、给博客贴的标签Tag、博客内容的评论Comment。
而且，Category与Post是一对多关系One-Many:一个分类下有很多Post，一个Post只能归属于一个Category；Post与Comment是一对多关系One-Many:一篇博客Post下有很多Comment，一条Comment只能归属于一篇Post；Post与Tag是多对多关系Many-Many:一篇Post有很多Tag，一个Tag下有很多Post。
开发环境：Laravel5.2 + MAMP + PHP7 + MySQL5.5

开发插件三件套

在先聊测试数据填充器seeder之前，先装上开发插件三件套，开发神器。先不管这能干些啥，装上再说。
1、barryvdh/laravel-debugbar

composer require barryvdh/laravel-debugbar --dev

2、barryvdh/laravel-ide-helper

composer require barryvdh/laravel-ide-helper --dev

3、mpociot/laravel-test-factory-helper

composer require mpociot/laravel-test-factory-helper --dev

然后在config/app.php文件中填上：

        /**
         *Develop Plugin
        */
        Barryvdh\Debugbar\ServiceProvider::class,
        Mpociot\LaravelTestFactoryHelper\TestFactoryHelperServiceProvider::class,
        Barryvdh\LaravelIdeHelper\IdeHelperServiceProvider::class,

设计表的字段和关联

设计字段

按照上文提到的Category、Post、Comment和Tag之间的关系创建迁移Migration和模型Model，在项目根目录输入:

php artisan make:model Category -m
php artisan make:model Post -m
php artisan make:model Comment -m
php artisan make:model Tag -m

在各个表的迁移migrations文件中根据表的功能设计字段：

//Category表
class CreateCategoriesTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('categories', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name')->comment('分类名称');
            $table->integer('hot')->comment('分类热度');
            $table->string('image')->comment('分类图片');
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop('categories');
    }
}
    
//Post表
class CreatePostsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('posts', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('category_id')->unsigned()->comment('外键');
            $table->string('title')->comment('标题');
            $table->string('slug')->unique()->index()->comment('锚点');
            $table->string('summary')->comment('概要');
            $table->text('content')->comment('内容');
            $table->text('origin')->comment('文章来源');
            $table->integer('comment_count')->unsigned()->comment('评论次数');
            $table->integer('view_count')->unsigned()->comment('浏览次数');
            $table->integer('favorite_count')->unsigned()->comment('点赞次数');
            $table->boolean('published')->comment('文章是否发布');
            $table->timestamps();
            //Post表中category_id字段作为外键，与Category一对多关系
            $table->foreign('category_id')
                  ->references('id')
                  ->on('categories')
                  ->onUpdate('cascade')
                  ->onDelete('cascade');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        //删除表时要删除外键约束，参数为外键名称
        Schema::table('posts', function(Blueprint $tabel){
            $tabel->dropForeign('posts_category_id_foreign');
        });
        Schema::drop('posts');
    }
}

//Comment表
class CreateCommentsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('comments', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('post_id')->unsigned()->comment('外键');
            $table->integer('parent_id')->comment('父评论id');
            $table->string('parent_name')->comment('父评论标题');
            $table->string('username')->comment('评论者用户名');
            $table->string('email')->comment('评论者邮箱');
            $table->string('blog')->comment('评论者博客地址');
            $table->text('content')->comment('评论内容');
            $table->timestamps();
            //Comment表中post_id字段作为外键，与Post一对多关系
            $table->foreign('post_id')
                  ->references('id')
                  ->on('posts')
                  ->onUpdate('cascade')
                  ->onDelete('cascade');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
    //删除表时要删除外键约束，参数为外键名称
        Schema::table('comments', function(Blueprint $tabel){
            $tabel->dropForeign('comments_post_id_foreign');
        });
        Schema::drop('comments');
    }
}

//Tag表
class CreateTagsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('tags', function (Blueprint $table) {
            $table->increments('id');
            $table->string('name')->comment('标签名称');
            $table->integer('hot')->unsigned()->comment('标签热度');
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::drop('tags');
    }
}

由于Post表与Tag表是多对多关系，还需要一张存放两者关系的表:

//多对多关系，中间表的命名laravel默认按照两张表字母排序来的，写成tag_post会找不到中间表
php artisan make:migration create_post_tag_table --create=post_tag

然后填上中间表的字段：

class CreatePostTagTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('post_tag', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('post_id')->unsigned();
            $table->integer('tag_id')->unsigned();
            $table->timestamps();
            //post_id字段作为外键
            $table->foreign('post_id')
                  ->references('id')
                  ->on('posts')
                  ->onUpdate('cascade')
                  ->onDelete('cascade');
            //tag_id字段作为外键      
            $table->foreign('tag_id')
                  ->references('id')
                  ->on('tags')
                  ->onUpdate('cascade')
                  ->onDelete('cascade');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::table('post_tag', function(Blueprint $tabel){
            $tabel->dropForeign('post_tag_post_id_foreign');
            $tabel->dropForeign('post_tag_tag_id_foreign');
        });
        Schema::drop('post_tag');
    }
}

设计关联

写上Migration后，还得在Model里写上关联：

class Category extends Model
{
    //Category-Post:One-Many
    public function posts()
    {
        return $this->hasMany(Post::class);
    }
}

class Post extends Model
{
    //Post-Category:Many-One
    public function category()
    {
        return $this->belongsTo(Category::class);
    }

    //Post-Comment:One-Many
    public function comments()
    {
        return $this->hasMany(Comment::class);
    }

    //Post-Tag:Many-Many
    public function tags()
    {
        return $this->belongsToMany(Tag::class)->withTimestamps();
    }
}

class Comment extends Model
{
    //Comment-Post:Many-One
    public function post()
    {
        return $this->belongsTo(Post::class);
    }
}

class Tag extends Model
{
    //Tag-Post:Many-Many
    public function posts()
    {
        return $this->belongsToMany(Post::class)->withTimestamps();
    }
}

然后执行迁移：

php artisan migrate

数据库中会生成新建表，表的关系如下：

Seeder填充测试数据

好，在聊到seeder测试数据填充之前，看下开发插件三件套能干些啥，下文中命令可在项目根目录输入php artisan指令列表中查看。
1、barryvdh/laravel-ide-helper
执行php artisan ide-helper:generate指令前：

不仅Facade模式的Route由之前的反白了变为可以定位到源码了，而且输入Config Facade时还方法自动补全auto complete，这个很方便啊。

输入指令php artisan ide-helper:models后，看看各个Model，如Post这个Model：

belongsTo(Category::class);
    }

    //Post-Comment:One-Many
    public function comments()
    {
        return $this->hasMany(Comment::class);
    }

    //Post-Tag:Many-Many
    public function tags()
    {
        return $this->belongsToMany(Tag::class)->withTimestamps();
    }
}

根据迁移到库里的表生成字段属性和对应的方法提示，在控制器里输入方法时会自动补全auto complete字段属性的方法：

2、mpociot/laravel-test-factory-helper
输入指令php artisan test-factory-helper:generate后，database/factory/ModelFactory.php模型工厂文件会自动生成各个模型对应字段数据。Faker是一个好用的生成假数据的第三方库，而这个开发插件会自动帮你生成这些属性，不用自己写了。

define(App\User::class, function (Faker\Generator $faker) {
    return [
        'name' => $faker->name,
        'email' => $faker->safeEmail,
        'password' => bcrypt(str_random(10)),
        'remember_token' => str_random(10),
    ];
});
$factory->define(App\Category::class, function (Faker\Generator $faker) {
    return [
        'name' =>  $faker->name ,
        'hot' =>  $faker->randomNumber() ,
        'image' =>  $faker->word ,
    ];
});

$factory->define(App\Comment::class, function (Faker\Generator $faker) {
    return [
        'post_id' =>  function () {
             return factory(App\Post::class)->create()->id;
        } ,
        'parent_id' =>  $faker->randomNumber() ,
        'parent_name' =>  $faker->word ,
        'username' =>  $faker->userName ,
        'email' =>  $faker->safeEmail ,
        'blog' =>  $faker->word ,
        'content' =>  $faker->text ,
    ];
});

$factory->define(App\Post::class, function (Faker\Generator $faker) {
    return [
        'category_id' =>  function () {
             return factory(App\Category::class)->create()->id;
        } ,
        'title' =>  $faker->word ,
        'slug' =>  $faker->slug ,//修改为slug
        'summary' =>  $faker->word ,
        'content' =>  $faker->text ,
        'origin' =>  $faker->text ,
        'comment_count' =>  $faker->randomNumber() ,
        'view_count' =>  $faker->randomNumber() ,
        'favorite_count' =>  $faker->randomNumber() ,
        'published' =>  $faker->boolean ,
    ];
});

$factory->define(App\Tag::class, function (Faker\Generator $faker) {
    return [
        'name' =>  $faker->name ,
        'hot' =>  $faker->randomNumber() ,
    ];
});

在聊第三个debugbar插件前先聊下seeder小技巧，用debugbar来帮助查看。Laravel官方推荐使用模型工厂自动生成测试数据，推荐这么写的：

//先输入指令生成database/seeds/CategoryTableSeeder.php文件: php artisan make:seeder CategoryTableSeeder
create()->each(function($category){
            $category->posts()->save(factory(\App\Post::class)->make());
        });
    }
}
//然后php artisan db:seed执行数据填充

但是这种方式效率并不高，因为每一次create()都是一次query，而且每生成一个Category也就对应生成一个Post，当然可以在each()里每一次Category继续foreach()生成几个Post，但每一次foreach也是一次query，效率更差。可以用debugbar小能手看看。先在DatabaseSeeder.php文件中填上这次要填充的Seeder:

    public function run()
    {
        // $this->call(UsersTableSeeder::class);
        $this->call(CategoryTableSeeder::class);
    }

在路由文件中写上：

Route::get('/artisan', function () {
    $exitCode = Artisan::call('db:seed');
    return $exitCode;
});

输入路由/artisan后用debugbar查看执行了15次query，耗时7.11ms：

实际上才刚刚输入几个数据呢，Category插入了10个，Post插入了5个。
可以用DB::table()->insert()批量插入，拷贝ModelFactory.php中表的字段定义放入每一个表对应Seeder，当然可以有些字段为便利也适当修改对应假数据。

class CategoryTableSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
//        factory(\App\Category::class, 20)->create()->each(function($category){
//            $category->posts()->save(factory(\App\Post::class)->make());
//        });

        $faker = Faker\Factory::create();
        $datas = [];
        foreach (range(1, 10) as $key => $value) {
            $datas[] = [
                'name' =>  'category'.$faker->randomNumber() ,
                'hot' =>  $faker->randomNumber() ,
                'image' =>  $faker->url ,
                'created_at' => \Carbon\Carbon::now()->toDateTimeString(),
                'updated_at' => \Carbon\Carbon::now()->toDateTimeString()
            ];
        }
        DB::table('categories')->insert($datas);
    }
}

class PostTableSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        $faker = Faker\Factory::create();
        $category_ids = \App\Category::lists('id')->toArray();
        $datas = [];
        foreach (range(1, 10) as $key => $value) {
            $datas[] = [
                'category_id' => $faker->randomElement($category_ids),
                'title' =>  $faker->word ,
                'slug' =>  $faker->slug ,
                'summary' =>  $faker->word ,
                'content' =>  $faker->text ,
                'origin' =>  $faker->text ,
                'comment_count' =>  $faker->randomNumber() ,
                'view_count' =>  $faker->randomNumber() ,
                'favorite_count' =>  $faker->randomNumber() ,
                'published' =>  $faker->boolean ,
                'created_at' => \Carbon\Carbon::now()->toDateTimeString(),
                'updated_at' => \Carbon\Carbon::now()->toDateTimeString()
            ];
        }
        DB::table('posts')->insert($datas);
    }
}

class CommentTableSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        $faker = Faker\Factory::create();
        $post_ids = \App\Post::lists('id')->toArray();
        $datas = [];
        foreach (range(1, 50) as $key => $value) {
            $datas[] = [
                'post_id' => $faker->randomElement($post_ids),
                'parent_id' =>  $faker->randomNumber() ,
                'parent_name' =>  $faker->word ,
                'username' =>  $faker->userName ,
                'email' =>  $faker->safeEmail ,
                'blog' =>  $faker->word ,
                'content' =>  $faker->text ,
                'created_at' => \Carbon\Carbon::now()->toDateTimeString(),
                'updated_at' => \Carbon\Carbon::now()->toDateTimeString()
            ];
        }
        DB::table('comments')->insert($datas);
    }
}

class TagTableSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        $faker = Faker\Factory::create();
        $datas = [];
        foreach (range(1, 10) as $key => $value) {
            $datas[] = [
                'name' =>  'tag'.$faker->randomNumber() ,
                'hot' =>  $faker->randomNumber() ,
                'created_at' => \Carbon\Carbon::now()->toDateTimeString(),
                'updated_at' => \Carbon\Carbon::now()->toDateTimeString()
            ];
        }
        DB::table('tags')->insert($datas);
    }
}

class PostTagTableSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        $faker = Faker\Factory::create();
        $post_ids = \App\Post::lists('id')->toArray();
        $tag_ids = \App\Tag::lists('id')->toArray();
        $datas = [];
        foreach (range(1, 20) as $key => $value) {
            $datas[] = [
                'post_id' =>  $faker->randomElement($post_ids) ,
                'tag_id' =>  $faker->randomElement($tag_ids) ,
                'created_at' => \Carbon\Carbon::now()->toDateTimeString(),
                'updated_at' => \Carbon\Carbon::now()->toDateTimeString()
            ];
        }
        DB::table('post_tag')->insert($datas);
    }
}

在DatabaseSeeder.php中按照顺序依次填上Seeder，顺序不能颠倒，尤其有关联关系的表:

class DatabaseSeeder extends Seeder
{
    /**
     * Run the database seeds.
     *
     * @return void
     */
    public function run()
    {
        // $this->call(UsersTableSeeder::class);
        $this->call(CategoryTableSeeder::class);
        $this->call(PostTableSeeder::class);
        $this->call(CommentTableSeeder::class);
        $this->call(TagTableSeeder::class);
        $this->call(PostTagTableSeeder::class);
    }
}

输入路由/artisan后，生成了10个Category、10个Post、50个Comments、10个Tag和PostTag表中多对多关系，共有9个Query耗时13.52ms：

It is working!!!

表的迁移Migration和关联Relationship都已设计好，测试数据也已经Seeder好了，就可以根据Repository模式来设计一些数据库逻辑了。准备趁着端午节研究下Repository模式的测试，PHPUnit结合Mockery包来TDD测试也是一种不错的玩法。
M(Model)-V(View)-C(Controller)模式去组织代码，很多时候也未必指导性很强，给Model加一个Repository，给Controller加一个Service，给View加一个Presenter，或许代码结构更清晰。具体可看下面分享的一篇文章。

最近一直在给自己充电，研究MySQL，PHPUnit，Laravel，上班并按时打卡，看博客文章，每天喝红牛。很多不会，有些之前没咋学过，哎，头疼。后悔以前读书太少，书到用时方恨少，人丑还需多读书。

研究生学习机器人的，本打算以后读博搞搞机器人的(研一时真是这么想真是这么准备的，too young too simple)。现在做PHP小码农了，只因当时看到智能机就激动得不行，决定以后做个码农试试吧，搞不好是条生路，哈哈。读书时觉悟太晚，耗费了青春，其实我早该踏入这条路的嘛，呵呵。Follow My Heart!

不扯了，在凌晨两点边听音乐边写博客，就容易瞎感慨吧。。

分享下最近发现的一张好图和一篇极赞的文章：

文章链接：Laravel的中大型專案架構

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